Add cdash.org support:

* the dashboard is there: http://my.cdash.org/index.php?project=Eigen
* now you can run the tests from the top build dir
  and submit report like that (from the top build dir):
  ctest -D Experimental
* todo:
 - add some nighlty builds (I'll add a few on my computer)
 - add valgrind memory checks, performances tests, compilation time tests, etc.

test/vectorization_logic.cpp

@@ -81,6 +81,9 @@ void test_vectorization_logic()
     LinearVectorization,NoUnrolling));
 
   VERIFY(test_sum(Matrix<float,5,2>(),
+    NoVectorization,CompleteUnrolling));
+  
+  VERIFY(test_sum(Matrix<float,6,2>(),
     LinearVectorization,CompleteUnrolling));
 
   VERIFY(test_sum(Matrix<float,16,16>(),